JPH04207282A - Video signal processor - Google Patents

Abstract

PURPOSE:To prevent the deterioration in image quality by a difference in the result of the motion detection on signal transmission and reception side by forming a part of quantized and transmitted videos as motion information and transferring the motion information of every picture element detected on the signal reception side to the signal reception side without increasing the information quantity to be transferred. CONSTITUTION:The lowermost bit of the video signals selected so as to be adaptable to the motion by a selective processing section 206 is replaced with the motion information 209 of every picture element in a motion information adding section 101 on the signal reception side. The screen is controlled by a perfect still signal so as not to replace the lowermost bit of the video signal when the entire part of the screen is a still or moving region. On the other hand, the case this lowermost bit is replaced and the case the bit is not replaced are controlled by a frame pulse 102. The output of the adding section 101 is inputted 211 on the signal reception side and the lowermost bit 105 of the received video signal is replaced with the motion information of every picture element on the signal reception side and such lowermost bit is also processed as the video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a video signal processing device for transmitting motion information for each pixel necessary for motion adaptive video signal processing.

2. Description of the Related Art Recently, motion adaptive processing for transmitting video signals that utilizes human visual characteristics has come to be actively used in the field of high-definition video signal transmission processing such as high-definition video. This motion adaptive processing utilizes the fact that human visual characteristics make it less noticeable even if the resolution is lowered in moving regions than in still regions, and performs band compression and encoding of video signals between still and moving regions. This is a process that increases efficiency by changing the process for Therefore, we perform motion detection to detect whether each pixel is a still pixel or a video pixel.
Depending on the motion information that is the detection result, it is necessary to select processing for still pixels and for moving images. These processes are required not only on the sending side but also on the receiving side. Hereinafter, conventional motion adaptive processing will be explained with reference to FIG.

FIG. 2 is a block diagram of the conventional device, where (al is the transmitting side and [b] is the receiving side. In Figure 2, 201
20 is an input terminal for inputting an analog video signal; 202 is an analog/digital converter; 203 is a still area processing unit for band compression; 204 is a dynamic area processing unit for band compression;
5 is a motion detection unit that detects motion information for each pixel, 206 is a selection processing unit that selects the output of the still area processing unit and the output of the moving area processing unit, and 207 is a transmission process for transmitting the processing results on the transmitting side. 208 is an output terminal for the transmission signal, 209 is motion information, 210 is a complete still signal indicating that the entire screen is a static area, 211 is an input terminal for inputting the transmission signal, 212 is a reception processing unit, and 213 is a restoration unit. 214 is a motion region processing section for restoration; 215 is a motion detection section for each pixel; 216 is a selection processing section for selecting the output of the still region processing section and the output of the motion region processing section; 218 is a display processing unit for displaying processing results on the receiving side; 218 is an output terminal for display signals; 219 is a received complete still signal; 220
is motion information detected on the receiving side.

The operation of the above configuration will be explained below.

First, an analog video signal inputted from an input terminal 201 is sampled by an analog/digital converter 202 and converted into a digital video signal. This digital video signal is input to a still area processing unit 203, a moving area processing unit 204, and a motion detection unit 205, respectively. Bandwidth compression processing is applied to each. Furthermore, the motion detection unit 205 performs motion detection for each pixel using frame correlation, and outputs motion information 309 indicating whether the pixel is a still pixel or a moving pixel. Furthermore, when the entire screen is a static area, the complete static signal 2
10 is output. In the selection processing unit 206, the motion information 2
According to 09, for still pixels, the still area processing unit 203
For video pixels, the output of the motion area processing unit 204 is selected, and the transmission processing unit 207 multiplexes a complete still signal 210 into the blanking period of the video signal, which has been subjected to band compression adapted to the motion. At the same time, the data is subjected to processing necessary for transmission, and then transmitted from the output terminal 208. The transmitted signal is input from the input terminal 211 and received by the reception processing section 212, and the band-compressed video signal and the complete still signal 219 are separated by one. The band-compressed video signal is subjected to respective restoration processes in a still area processing section 213 and a moving area processing section 214. Furthermore, the motion detection processing section 215 performs the same processing as the motion detection processing section 205 on the transmission side on the received video signal, and outputs motion information 220. At this time, when the complete stillness signal 219 indicates complete stillness, the motion information is forcibly controlled to indicate complete stillness for all pixels. In the selection processing unit 216, similarly to the transmission side, the motion information 220 is used to select the still area processing unit 21.
3 and the output of the dynamic area processing unit 214 are selected, processed for display by the display processing unit 217, and then outputted from the output terminal 218.

Problems to be Solved by the Invention However, in the conventional motion adaptive processing as described above, if the entire screen is a static area, the same information as the motion information detected on the transmitting side can be used on the receiving side. There is no problem, but in other cases, the transmitting and receiving sides perform separate motion detection processing, so if the motion detection results differ between the transmitting and receiving sides, it is possible that the motion was not correctly adapted. The problem is that it is not possible to select the processing, and as a result, a large deterioration in image quality occurs.

The present invention solves the above problems of the prior art, and aims to prevent image quality deterioration caused by differences in motion detection results between the transmitting side and the receiving side.

Means for Solving the Problems The present invention provides a motion detection means for detecting motion information for each pixel when dividing a video into a still region and a moving region and performing processing adapted to each region in order to transmit a video. a motion processing means that uses a part of the quantized video signal as the motion information; a non-motion processing means that does not use a part of the video signal as the motion information when the entire screen is a static area or a moving area; A switching means for switching between using and not using a part of the video signal as motion information, and applying motion information of a previous screen that transmits motion information to a screen that does not transmit motion information for each pixel. The above object is achieved by providing application means for transmitting motion information for each pixel.

According to the above configuration, the present invention uses a part of the quantized video signal to be transmitted as motion information, thereby receiving motion information for each pixel detected on the transmitting side without increasing the amount of information to be transmitted. This is to prevent image quality deterioration caused by differences in motion detection results between the sending and receiving sides.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a video signal processing device according to an embodiment of the present invention, where (al is the transmitting side and (bl is the receiving side).

In FIG. 1, 101 is a motion information addition unit that uses the least significant bit of a quantized video signal as motion information, 102 is a frame pulse signal indicating a screen division, and 103 is a screen where motion information for each pixel is not transmitted. A memory for interpolating motion information, 104 is a gate processing unit, 105 is the least significant bit of the received video signal, 106 is motion information used on the receiving side, and 201 to 214 and 216 to 219 are shown in FIG. It has the same structure as the conventional one.

The operation of the above configuration will be explained below.

First, the analog video signal input from the input terminal 201 is subjected to the same processing as in the conventional example in the analog/digital converter mW2O2, the still area processing section 203, the moving area processing section 204, the motion detection section 205, and the selection processing section 206. Ru.

The motion information adding section 101 performs a process of replacing the least significant bit of the video signal selected by the selection processing section 206 to adapt to the motion with motion information 209 for each pixel. However, if the entire screen is a static or moving area,
In order not to replace the least significant bit of the video signal, it is controlled by a complete still signal 210, and a process for switching between replacing and not replacing the least significant bit of the video signal is performed for each screen. Frame pulse 102
controlled by The output of the motion information adding section 101 is
The transmission processing unit 207 performs the same processing as in the conventional example, and outputs from the output terminal 208. The transmission signal output from the output terminal 208 is input from the input terminal 211, and is sent to the reception processing section 212, the static region processing section 213, and the dynamic region processing section 214.
In this case, the same processing as in the conventional example is performed. That is, the least significant bit, which is replaced with motion information for each pixel on the transmitting side, is also processed as a video signal.

Furthermore, the least significant bit 105 of the received video signal is input to the memory 103, and the motion information of the previous screen where the motion information of each pixel is transmitted is applied as the motion information of the screen where the motion information of each pixel is not transmitted. After that, if the entire screen is not a static area or a moving area, it is left as is, and if the entire screen is a static area or a moving area, all pixels in the screen are changed to still pixels or moving pixels. The gate processing unit 104 processes the motion information so that it becomes motion information indicating a certain fact, and outputs it to the selection processing unit 216 as motion information 106 on the receiving side. Then, the selection processing section 216 and the display processing section 217 perform the same processing as in the conventional example, and the restored video signal is output from the output terminal 218. Note that the least significant bit of the video signal subjected to transmission processing in the transmission processing section 207 is transmitted to the reception processing section 21.
It is assumed that the data has been restored after the reception processing in step 2.

In this way, in this embodiment, since the motion information for each pixel detected on the transmitting side is transmitted on the least significant bit of the video signal to be transmitted, the motion information for each pixel is transmitted without changing the amount of information to be transmitted. Information can be transmitted. Furthermore, by using the least significant bit of the video signal as motion information, the gradation of the video signal decreases.If the entire screen is a static area, the deterioration of image quality due to this decrease is noticeable, and the motion information is not used as the video signal. By not adding it or using the least significant bit in other cases, the deterioration is made less noticeable. Furthermore, by switching whether or not to transmit motion information for each screen, video signals without motion information are also transmitted.
The deterioration of gradation becomes almost unnoticeable. Also, by performing this switching process for each screen, there are some screens that do not transmit motion information, but since the temporal changes in motion information for each pixel are not so rapid, there is no problem even if the motion information of the previous screen is used. Must not be. However, when the entire screen suddenly becomes a moving area, such as during a scene change, applying the motion information from the previous screen will cause a noticeable deterioration in image quality. There is no problem because it is controlled by the signal shown (when the complete standstill signal is OFF).

Effects of the Invention As described above, the present invention provides a motion detection means for detecting motion information for each pixel when dividing a video into a still region and a moving region and performing processing adapted to each region in order to transmit a video. a motion processing means that uses a part of the quantized video signal as the motion information; a non-motion processing means that does not use a part of the video signal as the motion information when the entire screen is a static area or a moving area; A switching means for switching between using and not using a part of the video signal as motion information, and applying motion information of a previous screen that transmits motion information to a screen that does not transmit motion information for each pixel. By providing an application means to transfer the motion information for each pixel detected on the transmitting side to the receiving side by simply adding a simple circuit, without increasing the amount of information of the transmitted signal, which is limited by the band of the transmission path. It is possible to eliminate the problem of gradation deterioration due to this, and by eliminating motion detection processing on the receiving side, the circuit scale can be significantly reduced, so the effect is is big.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a video signal processing device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional video signal processing device. 101...Motion information adding unit, 102...Frame pulse, 103...Memory, 104...Gate processing unit, 105...Least significant bit of video signal, 201...
Input terminal, 202...analog/digital converter,
203... Still area processing unit, 204... Moving area processing unit, 205... Motion detection unit, 206... Selection processing unit, 207... Transmission processing unit, 208... Output terminal, 2
11... Input terminal, 212... Reception processing unit, 213
... Still area processing unit, 214... Moving area processing unit, 2
15...Motion detection unit, 216...Selection processing unit, 21
7... Display processing unit, 218... Output terminal. Name of agent: Patent attorney Akira Okaji and two others
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Claims (1)

[Claims] In order to transmit a video, when dividing the video into a still region and a moving region and performing processing adapted to each region, a motion detection means detects motion information for each pixel, and a part of the quantized video signal is used to detect the motion information. a motion processing means that does not use a part of the video signal as motion information when the entire screen is a static area or a moving area; and a case where a part of the video signal is used as motion information for each screen. A video signal processing device comprising: a switching means for switching between pixel-by-pixel motion information and no pixel-by-pixel motion information; and an application means for applying motion information of a previous screen transmitting motion information to a screen that does not transmit motion information for each pixel. .